The blood center, at 12395 Cortez Blvd., Spring Hill, is open from 10 a.m. to 4 p.m. Sundays, 9 a.m. to 5 p.m. weekdays, and from 8 a.m. to 2 p.m. Saturdays. Donors must be 16 or older (16-year-olds must have written parental consent). All donors must present photo identification. For information, call (352) 596-2002.